timing belt waring A4

just had to rebuild the engine on a customers 1.8ltr 20 valve A4 because he neglected to change his cambelt. it cost him almost £1000. all 20 valves were ruined, however when we called audi for the replacement belt etc they informed us that there was a modification to the tensioner and pulley, probably common knowledge in audi dealership circles but the owner had no idea, and subsequently this was (in our opinion) the reason for failure. despite the fact that his renewal mileage was overdue. be warned.......these belts WILL fail, and cause major damage if not looked after.